Fan assembly and portable fan

Abstract

The utility model relates to the technical field of fans, in particular to a fan assembly and a portable fan, the fan assembly provided by the utility model axially supplies air from back to front, and the fan assembly comprises a rotating seat, a rotating shaft and a rotating shaft, the fan blades are distributed on the surface of the rotating seat at intervals and spirally extend from back to front; the surface of the rotating base protrudes in the radial direction and is an arc face from back to front. The air flow is more effectively guided through the smooth arc shape, the loss of the air flow in the conveying process is reduced, and the output air volume is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field, especially a fan assembly and portable fan. BACKGROUND

[0002] With the continuous development of electronic technology and the growing demand of consumers for portable devices, new requirements are put forward for portable fans.

[0003] The existing portable fan is generally an axial fan, which is simple in structure and easy to manufacture. With the progress of technology, some portable fans can perform turbine strong wind gathering, have the characteristics of high efficiency, low noise and comfort, and gradually become the choice of many users. However, some portable fans have unnatural transitions on the surface of the fan, which increases the resistance and causes the loss of air volume on the surface of the fan. CONTENT OF THE UTILITY MODEL

[0004] To solve the problem of unnatural transition on the surface of the fan of some existing portable fans, which increases the resistance and causes the loss of air volume on the surface of the fan, the utility model provides a fan assembly and a portable fan.

[0005] The technical problem of the utility model is solved by providing a fan assembly that blows air axially from back to front, comprising:

[0006] A rotating seat has a part with increasing radial dimension from back to front;

[0007] A plurality of fan blades are distributed on the surface of the rotating seat at intervals and extend spirally from back to front;

[0008] Among them, the surface of the rotating seat is radially convex and presents an arc surface from back to front.

[0009] Preferably, the rotating seat comprises a rear air guide part, a fan blade connecting part and a front air guide part arranged axially in sequence from back to front, and the radial radius of the rotating seat gradually increases from the rear end of the rear air guide part to the front end of the fan blade connecting part, the radial radius of the front air guide part is constant from back to front; a plurality of fan blades are distributed on the fan blade connecting part at intervals and extend spirally on the fan blade connecting part from back to front.

[0010] Preferably, the axial length of the fan blade connecting part is greater than the axial length of the front air guide part, and the axial length of the front air guide part is greater than the axial length of the rear air guide part.

[0011] Preferably, the fan blade comprises a fan blade root end connected to the fan blade connecting part and a fan blade top end away from the fan blade connecting part; the installation angle of the fan blade root end of the fan blade is 32-37°; the installation angle of the fan blade top end of the fan blade is 47-53°.

[0012] Preferably, the fan blade comprises a fan blade tail end at the rear end and a fan blade head end at the front end; the radial radius of the rotating seat corresponding to the position of the fan blade head end of the fan blade is 14.45-18.45 mm, the radial radius of the rotating seat corresponding to the position of the fan blade tail end of the fan blade is 8-12 mm, and the radial radius of the rear end of the rear air guide part is 2.62-6.62 mm.

[0013] Preferably, the axial length of the fan blade is 1 / 2 to 3 / 4 of the axial length of the rotating seat.

[0014] Preferably, the axial length of the rotating seat is 21-25 mm, and the axial length of the fan blade is 12-16 mm.

[0015] Preferably, the inner side of the rotating seat is provided with a mounting groove, the groove wall of the mounting groove and the rotating seat form a double-layer structure, and the mounting groove is used for mounting a motor assembly.

[0016] Preferably, the fan blade head end of one of the two adjacent fan blades is correspondingly mapped between the fan blade tail end and the fan blade head end of the other fan blade in the axial direction of the rotating seat.

[0017] The utility model discloses a portable fan, including pressurizing piece and as any one of the above-mentioned fan assembly, the fan assembly and pressurizing piece are sequentially arranged along the axial direction, and the pressurizing piece comprises a pressurizing seat and a plurality of vanes, and the plurality of vanes are arranged on the pressurizing seat at intervals.

[0018] Compared with the prior art, the fan assembly and the portable fan provided by the utility model have the following advantages:

[0019] 1. The surface of the rotating seat is convex along the radial direction, and gradually increases in the direction of the arc surface from the rear to the front along the radial radius of the rotating seat, so that the surface of the rotating seat of the fan assembly, i.e. the air guide surface, can present an arc transition, the air guide surface can be smoothly transitioned, the separation of air flow on the air guide surface is reduced, the residence of air flow at the concave part or the corner part and the resistance of the concave part or the corner part to the air flow are avoided, and then the air flow is more effectively guided through the relatively smooth arc line shape, the loss of the air flow during transmission is reduced, and the air volume delivered is improved.

[0020] 2. By setting the radial radius of the rotating base sequentially from the rear air guide section to the fan blade connection section, the surface of the rotating base gradually rises relative to the axis of the rotating base along the fan direction. This achieves a seamless connection between the rear air guide section and the fan blade connection section with an increasing radial radius, facilitating the gradual increase of airflow pressure on the surface of the rotating base along the airflow direction. Furthermore, by setting multiple fan blades on the fan blade connection section, some of the airflow entering the portable fan is guided to the fan blade connection section through the rear air guide section, and some of the airflow delivered by the fan blades on the fan blade connection section is delivered out along the front air guide section, thereby avoiding airflow loss at the entry and exit points of the fan assembly.

[0021] 3. By setting the axial length of the fan blade connection to be greater than the axial lengths of both the front and rear guide sections, airflow can be driven more effectively, reducing airflow separation and thus improving the overall airflow efficiency and air pressure of the fan assembly. Furthermore, the greater axial length of the front guide section ensures sufficient airflow from the fan blades, facilitating the delivery of air along the front guide section and improving the stability of the airflow velocity and volume delivered by the fan blades.

[0022] 4. By setting the installation angle of the fan blade root to 32-37° and the installation angle of the fan blade tip to 47-53°, the curvature of the fan blade tip is greater than that of the fan blade root, thereby increasing the kinetic energy of the airflow at the fan blade tip and enhancing the wind pressure output. Furthermore, by controlling the installation angles of the fan blade root and tip, the air delivery range and noise level of the fan assembly can be ensured, and the air volume and wind pressure delivered by the fan assembly can be maximized within both ranges.

[0023] 5. By setting the radial radius of the rotating seat at the front end of the fan blade to 14.45-18.45mm, the radial radius of the rotating seat at the rear end of the fan blade to 8-12mm, and the radial radius of the rear end of the rear guide section to 2.62-6.62mm, the increase in the radial radius of the fan blade connection is less than that of the rear guide section. This results in a gentler slope of the front guide section, which facilitates rapid airflow generation and pressurization at the fan blade connection. Furthermore, when the fan blades discharge airflow, some of the airflow discharged along the surface of the fan blade connection can be smoothly discharged along the front guide section, which helps to achieve more stable pressurization and acceleration of the airflow and further reduces noise.

[0024] 6. By setting the axial length of the fan blade to 1 / 2 to 3 / 4 of the axial length of the rotating base, the fan blade connection occupies at least half of the rotating base surface, thereby ensuring that the fan blade can provide a stronger airflow, deliver a larger air volume, and increase the airflow pressure effect.

[0025] 7、By setting the installation groove in the rotating seat, other components of the portable fan are installed in the installation groove, so as to realize the connection with other components; the groove wall of the installation groove and the rotating seat form a double-layer structure, so as to improve the protection effect of the internal components of the installation groove, and the double-layer structure is also used to reduce the noise of the components in the installation groove.

[0026] 8、By setting the fan blade head of one of the two adjacent fan blades to correspond to the mapping between the fan blade tail and the fan blade head of the other fan blade along the axial direction of the rotating seat, the straight flow between the two adjacent fan blades is avoided, the air guide length and the bending degree of the air guide route between the two adjacent fan blades are increased, and the air flow with larger and stronger air volume is beneficial.

[0027] 9、The utility model also provides a portable fan, has same beneficial effect with above-mentioned fan assembly, and does not make superfluous repetition here.

DRAWINGS

[0028] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be briefly introduced the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without the creative labor.

[0029] Figure 1 It is the three-dimensional structure schematic diagram of the fan assembly provided by the first embodiment of the utility model.

[0030] Figure 2 It is the side view of the fan assembly provided by the first embodiment of the utility model. Figure 1 .

[0031] Figure 3 It is the side view of the fan assembly provided by the first embodiment of the utility model. Figure 2 .

[0032] Figure 4 It is the cutaway schematic diagram of the fan assembly provided by the first embodiment of the utility model.

[0033] Figure 5 It is the side view of the fan assembly provided by the first embodiment of the utility model. Figure 3 .

[0034] Figure 6 It is the rear view of the fan assembly provided by the first embodiment of the utility model.

[0035] Figure 7 It is the three-dimensional structure schematic diagram of the portable fan provided by the second embodiment of the utility model.

[0036] Figure 8 is a sectional view of the fan blade assembly of the portable fan according to the second embodiment of the present application.

[0037] Brief Description of the Drawings

[0038] 1, fan blade assembly; 2, power supply unit; 3, portable fan;

[0039] 10, fan assembly; 11, rotating seat; 12, fan blade; 20, pressure member; 21, pressure seat; 22, stationary blade; 30, motor; 40, display assembly;

[0040] 111, rear air guide part; 112, fan blade connecting part; 113, front air guide part; 114, mounting groove; 121, fan blade top end; 122, fan blade root end; 123, fan blade head end; 124, fan blade tail end; 211, mounting cavity. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0042] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right", and similar expressions as used herein are used for explanation purposes only.

[0043] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0044] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For ordinary skilled persons in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0045] In addition, the terms "mounting", "arrangement", "provided with", "connected", "linked" should be understood broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be directly linked, or indirectly linked through intermediate media, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0046] Please refer to Figure 1 The utility model provides a fan assembly 10, from rear to front axial air supply, comprising: rotating seat 11, from rear to front with the part of radial increase; Multiple fan blades 12, interval distribution is in the surface of rotating seat 11, from rear to front helical extension;Wherein, the surface of rotating seat 11 is radially convex, from rear to front arc surface.

[0047] It can be understood that the axial direction is the axis direction of the fan assembly 10, and the fan assembly 10 is axially supplied from rear to front, and the air supply direction is the wind flow direction f (as shown f). Multiple fan blades 12 can be arranged to be distributed on the surface of the rotating seat 11 with gradually increasing radial radius along the axial direction, and to be helically extended from rear to front, that is, to be helically extended along the direction of gradually increasing radial radius of the rotating seat 11, so as to form the fan assembly 10, so as to simultaneously utilize the linear airflow of axial flow and the pressure gain of centrifugal, and have the advantages of both axial flow and centrifugal fans, so as to generate relatively large air volume in a smaller volume, so that the fan assembly 10 can provide stronger wind power and lower noise when in use. Figure 2 The surface of the rotating seat 11 is radially convex, and is arc-shaped along the direction of gradually increasing radial radius of the rotating seat 11, so that the surface of the rotating seat 11, that is, the air guide surface of the fan assembly 10, can be arc-shaped transition, so that the air guide surface can be smoothly transitioned, the separation of the air flow on the air guide surface is reduced, the residence of the air flow at the recessed part or the corner part is avoided, and the resistance of the air flow generated by the recessed part or the corner part is avoided, so as to more effectively guide the air flow through the relatively smooth arc shape, reduce the loss of the air flow during transmission, and improve the air supply volume.

[0048] Please refer to Figures 1-4 Further, the rotating seat 11 comprises a rear air guide part 111, a fan blade connecting part 112 and a front air guide part 113 arranged in sequence along the axial direction from rear to front, and the radial radius of the rotating seat 11 gradually increases from the rear end of the rear air guide part 111 to the front end of the fan blade connecting part 112, and the radial radius of the front air guide part 112 is constant from rear to front; Multiple fan blades 12 are distributed on the fan blade connecting part 112, and are helically extended on the fan blade connecting part 112 from rear to front.

[0049] Specifically, the fan blades 12 on the fan blade connecting portion 112 are arranged in a spiral extending manner to form the fan assembly 10 with the whole rotating seat 11. The rear air guide portion 111 is arranged to make the air flow uniformly enter the fan blades 12 on the fan blade connecting portion 112 along the surface of the rear air guide portion 111. The front air guide portion 113 is arranged to make the part of the air flow accelerated by the fan blades 12 be more uniformly guided out, reducing the loss of air volume caused by the cross section at the blade root position of the fan blades 12.

[0050] It should be noted that the rear air guide portion 111, the fan blade connecting portion 112, the front air guide portion 113 and the fan blades on the fan blade connecting portion 112 can be integrally formed, so that the stress concentration of the connecting points of each part is reduced, the whole structure is more firm, and the risk of vibration and deformation during the operation of the fan assembly 10 is reduced. And the integral molding reduces the gap, which is conducive to realizing seamless design, so as to effectively reduce the friction between the air flow and each part, thereby reducing the noise.

[0051] Please refer to Figure 4 It can be understood that the radial radius of the rotating seat 11 gradually increases from the rear air guide portion 111 and the fan blade connecting portion 112, so that the surface of the rotating seat 11 gradually rises along the air flow direction f relative to the axis L (such as Figure 4 It can be understood that the radial radius of the rotating seat 11 gradually increases from the rear air guide portion 111 and the fan blade connecting portion 112, so that the surface of the rotating seat 11 gradually rises along the air flow direction f relative to the axis L (such as

[0052] It can be understood that the radial radius of the front air guide portion 113 remains constant and can be the same as the maximum radius range or maximum value of the fan blade connecting portion 112, so that the surface of the front air guide portion 113 can be parallel to the axis L of the rotating seat 11, so that the air passing through the surface of the front air guide portion 113 can be easily guided out in a straight flow parallel to the axis L of the rotating seat 11.

[0053] Please refer to Figures 1-4 , the rotating seat 11 is in a semi-elliptical shape.

[0054] It can be understood that the shape of the semi-ellipsoid can achieve the radial radius of the rotating seat 11 sequentially increasing from the rear air guide part 111, the blade connecting part 112, and remaining constant at the front air guide part 113, making the surface transition of the rotating seat 11 more natural, improving the lift efficiency of the blade 12, reducing the resistance, and reducing the loss of the air volume on the surface of the rotating seat 11, so as to achieve better operation effect of the fan assembly 10. In addition, the shape of the semi-ellipsoid can effectively guide the air flow to reduce the vortex and turbulence phenomenon when operating in mixed flow, thereby improving the smoothness and stability of the air flow, which helps to maximize the air volume and air pressure generated by the fan assembly 10.

[0055] Please refer to Figure 2 and Figure 3 , further, the blade 12 comprises a blade root end 122 connected to the blade connecting part 112 and a blade tip end 121 away from the blade connecting part 112; the installation angle of the blade root end 122 of the blade 12 is 32-37°; the installation angle of the blade tip end 121 of the blade 12 is 47-53°.

[0056] Specifically, the blade 12 comprises a blade tip end 121 and a blade root end 122, and a blade leading end 123 and a blade trailing end 124. The blade root end 122 is one end of the surface of the blade connecting rotating seat 11, and the blade tip end 121 is away from the blade root end 122.

[0057] It can be understood that by setting the installation angle of the blade root end 122 of the blade 12 to be 32-37°, and the installation angle of the blade tip end 121 of the blade 12 to be 47-53°, the bending degree of the blade 12 on the blade connecting part 112 can be ensured to achieve the maximum air supply volume and air speed. The range of the installation angle of the blade root end 122 and the blade tip end 121 is set so that the bending degree of the blade tip end 121 on the blade 12 is greater than that of the blade root end 122, thereby increasing the kinetic energy of the air flow at the blade tip end 121 to enhance the air pressure output. In addition, by controlling the size of the installation angle of the blade root end 122 and the blade tip end 121, the air supply range and noise level of the fan assembly 10 can be ensured, and the air volume and air pressure output by the fan assembly 10 can be maximized within the range of both.

[0058] Please refer to Figure 4 , further, the blade 12 further comprises a blade trailing end 124 at the rear end and a blade leading end 123 at the front end; the radial radius R1 (as shown in Figure 4 R1) of the rotating seat 11 at the corresponding position of the blade leading end 123 of the blade 12 is 14.45-18.45mm, and the radial radius R2 (as shown in Figure 4 R2) of the rotating seat 11 at the corresponding position of the blade trailing end 124 of the blade 12 is 8-12mm, and the radial radius R3 (as shown in Figure 4The R 3 shown is 2.62-6.62mm.

[0059] Understandably, the front and rear ends of the fan blade 12 are defined by the airflow direction of the fan assembly 10, that is, the airflow passes through the rear end and the front end in sequence, the fan blade head end 123 is the end close to the front air guide 113; the fan blade tail end 124 is the end close to the rear air guide 111, and the corresponding airflow passes through the fan blade tail end 124 and the fan blade head end 123 in sequence. The radial radius R1 of the rotating seat 11 at the fan blade tip 123 of the fan blade 12 is 14.45-18.45 mm, the radial radius R2 of the rotating seat 11 at the fan blade tail 124 of the fan blade 12 is 8-12 mm, and the radial radius R3 of the rear end of the rear guide section 111, i.e., the boundary part of the rear guide section 111 away from the fan blade connection end, is 2.62-6.62 mm. This makes the increase in radial radius on the fan blade connection section 112 less than the increase in the rear guide section 111, and makes the slope from the fan blade connection section 112 to the front guide section 113 gentler. This is conducive to the rapid generation and pressurization of airflow on the fan blade connection section 112. When the fan blade 12 discharges airflow, some of the airflow discharged along the surface of the fan blade connection section 112 can be discharged smoothly along the front guide section 113, which is conducive to achieving more stable pressurization and acceleration of airflow and further reducing noise.

[0060] Please see Figure 5 Furthermore, the axial length P2 of the fan blade connection 112 (e.g.) Figure 5 As shown, P2) is greater than the axial length P3 of the front guide section 113 (e.g., Figure 5 As shown in P3), the axial length P3 of the front guide section 113 is greater than the axial length P1 of the rear guide section 111 (as shown in P3). Figure 5 As shown in P1).

[0061] Understandably, the axial length of the fan blade connection 112 can be greater than the axial length of the front guide section 113 and the rear guide section 111 to more effectively drive airflow, reduce airflow separation, and thus improve the overall airflow efficiency and wind pressure of the fan assembly 10. Furthermore, the axial length of the front guide section 113 is greater than that of the rear guide section 111, ensuring the guide length of the front guide section 113. This facilitates the airflow delivered by the fan blade 12 along the front guide section 113, improving the stability of the airflow velocity and volume delivered by the fan blade 12. It also prevents the front guide section 113 from being too short, which would affect the airflow velocity and volume delivered by the fan blade 12, further reducing the airflow loss caused by the cross-section of the airflow delivered at the blade root position of the fan blade 12.

[0062] Please see Figure 5Further, the axial length of the fan blade 12 is the axial length P2 of the fan blade connecting portion, and the axial length P2 of the fan blade connecting portion 112 is 1 / 2 to 3 / 4 of the axial length P0 (as shown in P0) of the rotating seat 11, so that the fan blade connecting portion 112 occupies at least half of the surface of the rotating seat 11, thereby ensuring the length of the overall spiral extension of the fan blade 12 on the rotating seat 11, and ensuring that the fan blade 12 can provide stronger air flow, deliver larger air volume, and increase the air flow pressurization effect. Figure 5

[0063] Please refer to Figure 5 Further, the axial length P0 of the rotating seat 11 is 21-25 mm, and the axial length P1 of the fan blade 12 is 12-16 mm, which meets the requirement that the axial length of the fan blade 12 is 1 / 2 to 3 / 4 of the axial length of the rotating seat 11, and further accurately controls the axial length P2 of the fan blade connecting portion 112 and the axial length P0 of the rotating seat 11, thereby ensuring the overall quality of the final fan assembly 10, and ensuring the air supply performance and reliability of the fan assembly 10.

[0064] Please refer to Figure 1 and Figure 4 Further, the inner side of the rotating seat 11 is provided with a mounting groove 114, and the groove wall of the mounting groove 114 and the rotating seat 11 form a double-layer structure, and the mounting groove 114 is used to mount the motor assembly.

[0065] Specifically, the double-layer structure includes the outer wall of the fan blade 12 and the groove wall of the mounting groove 114, and the annular radial radius enclosed by the rotating seat 11 is greater than the annular radial radius enclosed by the groove wall of the mounting groove 114, and the rotating seat 11 and the groove wall of the mounting groove 114 are connected by a plurality of connection structures arranged at intervals, thereby improving the stability between the two layers. The mounting groove 114 can mount other components of the portable fan 3, such as the motor assembly, to realize the connection between the fan assembly 10 and other components without affecting the rotation of the fan assembly 10, and the ring side of the rotating seat 11 corresponding to the mounting groove 114 is arranged as a double-layer structure to improve the protection effect of the internal components of the mounting groove 114, and the double-layer structure is also used to reduce the noise in the air flow.

[0066] Please refer to Figure 5 and Figure 6 ​Further, the leading end 123 of one of the two adjacent fan blades 12 is mapped along the axial direction of the rotating seat 11 between the trailing end 124 and the leading end 123 of the other fan blade 12, so that no air guide path parallel to the axis L of the rotating seat 11 is formed between the air guide paths of the two adjacent fan blades 12, thereby avoiding the straight air flow between the two adjacent fan blades 12, increasing the air guide length and the bending degree of the air guide path between the two adjacent fan blades 12, and facilitating the output of air flow with a larger volume, a faster speed, and a stronger force.

[0067] It should be noted that the number of fan blades 12 on the fan assembly 10 is odd, for example, 7, 9, 11, etc., which can be set according to actual conditions, and the present embodiment does not limit this. Setting the number of fan blades 12 as odd can reduce resonance and enhance stability, avoid resonance of an even number of blades during high-speed rotation, and cause blade fatigue or even breakage. Moreover, setting the number of fan blades 12 as odd can form a more complex and effective air flow pattern during rotation, thereby enhancing the air supply effect of the fan assembly 10.

[0068] Referring to Figure 7 and Figure 8 The second embodiment of the present utility model further provides a portable fan 3, which comprises a pressurizing member 20 and the fan assembly 10 of any one of the first embodiment, and the fan assembly 10 and the pressurizing member 20 are sequentially arranged along the axial direction. The pressurizing member 20 comprises a pressurizing seat 21 and a plurality of stationary vanes 22, and the plurality of stationary vanes 22 are arranged on the pressurizing seat 21 at intervals.

[0069] It can be understood that the fan assembly 10 of the first embodiment can be used in the portable fan 3 and sequentially arranged along the axial direction with the pressurizing member 20 in the portable fan 3, so that the air flow entering the portable fan 3 sequentially passes through the fan assembly 10 and the pressurizing member 20, the air flow entering the portable fan 3 first passes through the fan assembly 10 to output strong air flow to the pressurizing member 20, and the pressurizing member 20 guides the air flow to the pressurizing member 20 through the extension of the stationary vane 22, and then the pressurizing member 20 continues to pressurize and speed up the air flow and sends it out of the portable fan 3. The portable fan 3 comprises the fan assembly 10 of any one of the first embodiment, has the same technical effects as the fan assembly 10 of the first embodiment, and the present embodiment does not limit this.

[0070] It should be noted that in the present embodiment, the portable fan 3 can be a handheld portable fan, a small fan with only the above-mentioned fan assembly 10, a desktop fan, a clip fan, a variable fan, etc., and the present embodiment does not limit this.

[0071] Optionally, the portable fan 3 can include a fan blade assembly 1 and a power supply part 2 connected with the fan blade assembly 1. The pressurizing part 20 and the fan assembly 10 are both arranged inside the fan blade assembly 1. The power supply part 2 is arranged outside the fan blade assembly 1 and electrically connected with the motor 30 to supply power for the motor 30, drive the fan assembly 10 to rotate and blow out the air flow. The power supply part 2 can be a handheld assembly for a user to hold and use, or stand on a plane, and the fan blade assembly 1 is used to blow air to the user.

[0072] Specifically, the pressurizing part 20 is arranged with a mounting cavity 211 close to one side of the rotating seat 11, the mounting groove 114 and the mounting cavity 211 are opposite and form a mounting space, and the motor 30 is received in the mounting space. Specifically, the power supply part 2 supplies power for the motor 30, and the motor 30 drives the fan assembly 10 as a whole to rotate, thereby driving the fan blades 12 to rotate.

[0073] Optionally, the fan blade assembly 1 further includes a display assembly 40 arranged on the side of the pressurizing seat 21 away from the fan assembly 10. The display assembly 40 can be used to display at least one of the power, the current gear, and the charging status.

[0074] Compared with the prior art, the fan assembly and the portable fan provided by the utility model have the following advantages:

[0075] 1. The surface of the rotating seat is convex along the radial direction, and gradually increases along the radial direction of the rotating seat from the back to the front, and presents an arc surface, so that the surface of the rotating seat of the fan assembly, that is, the air guide surface, can present an arc transition, the air guide surface can smoothly transition, the separation of the air flow on the air guide surface is reduced, the residence of the air flow at the recessed part or the corner part and the resistance of the recessed part or the corner part to the air flow are avoided, and then the air flow is more effectively guided through the relatively smooth arc shape, the loss of the air flow during transmission is reduced, and the air volume delivered is improved.

[0076] 2. The radial radius of the rotating seat is sequentially from the back air guide part to the fan blade connecting part, the surface of the rotating seat gradually rises along the fan direction relative to the axis of the rotating seat, to realize the seamless connection of the radial radius between the back air guide part and the fan blade connecting part, and facilitate the gradual pressurization of the air flow on the surface of the rotating seat along the air flow direction; and a plurality of fan blades are arranged on the fan blade connecting part, so that part of the air flow entering the inside of the portable fan is introduced to the fan blade connecting part through the back air guide part, and part of the air flow delivered by the fan blades on the fan blade connecting part is delivered along the front air guide part, thereby avoiding the loss of the air flow when entering the fan assembly and the loss of the air flow when being delivered from the fan assembly.

[0077] 3、By setting the axial length of the fan blade connecting part greater than the axial length of the front air guide part and the axial length of the rear air guide part, the air flow is more effectively pushed, the air flow separation phenomenon is reduced, and the overall air flow efficiency and air pressure of the fan assembly are improved. The axial length of the front air guide part is greater than the axial length of the rear air guide part, thereby ensuring the air guide length of the front air guide part, facilitating the air flow sent by the fan blade to be sent along the front air guide part, and improving the stability of the air speed and air volume of the air flow sent by the fan blade.

[0078] 4、By setting the installation angle of the fan blade root end to be 32-37° and the installation angle of the fan blade top end to be 47-53°, the bending degree of the fan blade top end is greater than that of the fan blade root end, thereby improving the kinetic energy of the air flow at the fan blade top end to enhance the air pressure output. By controlling the installation angle of the fan blade root end and the fan blade top end, the air supply range and noise level of the fan assembly can be ensured, and the air volume and air pressure sent by the fan assembly can be maximized within the range.

[0079] 5、By setting the radial radius of the rotating seat at the corresponding position of the fan blade head end to be 14.45-18.45mm, the radial radius of the rotating seat at the corresponding position of the fan blade tail end to be 8-12mm, and the radial radius of the rear end of the rear air guide part to be 2.62-6.62mm, the increase in the radial radius of the fan blade connecting part is less than that of the rear air guide part, the slope of the front air guide part is more gentle, which is conducive to the rapid generation and rapid pressurization of the air flow on the fan blade connecting part, and when the air flow is guided along the fan blade, part of the air flow guided along the surface of the fan blade connecting part can be smoothly guided along the front air guide part, which is conducive to achieving more stable pressurization and speed-up of the air flow, and further reducing noise.

[0080] 6、By setting the axial length of the fan blade to be 1 / 2 to 3 / 4 of the axial length of the rotating seat, the fan blade connecting part occupies at least half of the surface of the rotating seat, thereby ensuring that the fan blade can provide stronger air flow, send larger air volume, and increase the air flow pressurization effect.

[0081] 7、By setting the rotating seat to have an installation groove, it is convenient to install other components of the portable fan in the installation groove to realize the connection with other components. The groove wall of the installation groove and the rotating seat form a double-layer structure to improve the protection effect of the internal components of the installation groove, and the double-layer structure is also used to reduce the noise of the components located in the installation groove.

[0082] 8、By setting one of the two adjacent fan blades to have its fan blade head end corresponding to the fan blade tail end and the fan blade head end of the other fan blade along the axial direction of the rotating seat, the straight-through of the air flow between the two adjacent fan blades is avoided, the air guide length and the bending degree of the air guide route between the two adjacent fan blades are increased, and it is conducive to sending larger air volume and stronger air flow.

[0083] 9. The utility model also provides a portable fan with the same beneficial effect with above-mentioned fan assembly, which is not described here.

[0084] The fan assembly and the portable fan are described in detail above. The principles and implementation modes of the utility model are described by using specific examples. The above description of the embodiments is only used to help understand the method and core idea of the utility model. Meanwhile, for those skilled in the art, the specific implementation modes and application ranges can be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as a limitation of the utility model. Any modification, equivalent replacement, improvement, etc. within the principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A fan assembly for delivering air axially from rear to front, characterized in that: The fan assembly comprises: a rotating seat with radially increasing portions from back to front; a plurality of fan blades spacedly distributed on the surface of the rotating seat and spirally extended from back to front; wherein the surface of the rotating seat is radially convex and arc-shaped from back to front.

2. The fan assembly of claim 1, wherein: The rotating seat comprises a rear air guide portion, a fan blade connecting portion and a front air guide portion arranged in sequence from back to front along the axial direction, and the radial radius of the rotating seat gradually increases from the rear end of the rear air guide portion to the front end of the fan blade connecting portion, and the radial radius of the front air guide portion is constant from back to front; the plurality of fan blades are spacedly distributed on the fan blade connecting portion and spirally extended from back to front on the fan blade connecting portion.

3. The fan assembly of claim 2, wherein: The axial length of the fan blade connecting portion is greater than the axial length of the front air guide portion, and the axial length of the front air guide portion is greater than the axial length of the rear air guide portion.

4. The fan assembly of claim 1, wherein: The fan blade comprises a fan blade root end connected to the fan blade connecting portion and a fan blade top end away from the fan blade connecting portion; the installation angle of the fan blade root end of the fan blade is 32-37°; and the installation angle of the fan blade top end of the fan blade is 47-53°.

5. The fan assembly of claim 2, wherein: The fan blade comprises a fan blade tail end at the rear end and a fan blade head end at the front end; the radial radius of the rotating seat at the corresponding position of the fan blade head end of the fan blade is 14.45-18.45mm, the radial radius of the rotating seat at the corresponding position of the fan blade tail end of the fan blade is 8-12mm, and the radial radius of the rear end of the rear air guide portion is 2.62-6.62mm.

6. The fan assembly of claim 1, wherein: The axial length of the fan blade is 1 / 2 to 3 / 4 of the axial length of the rotating seat.

7. The fan assembly of claim 6, wherein: The axial length of the rotating seat is 21-25mm, and the axial length of the fan blade is 12-16mm.

8. The fan assembly of claim 1, wherein: The inner side of the rotating seat is provided with a mounting groove, and the groove wall of the mounting groove and the rotating seat form a double-layer structure, and the mounting groove is used for mounting a motor assembly.

9. The fan assembly of claim 1, wherein: In any two adjacent fan blades, the fan blade head end of one of the fan blades is correspondingly mapped between the fan blade tail end and the fan blade head end of the other fan blade along the axial direction of the rotating seat.

10. A portable fan characterized by: The fan assembly comprises a pressurizing member and a fan assembly according to any one of claims 1-9, the fan assembly and the pressurizing member are arranged in sequence along the axial direction, and the pressurizing member comprises a pressurizing seat and a plurality of static blades spacedly arranged on the pressurizing seat.

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